Valve-guide-aligning tool



' June 29 1926.

F. W. SANBORN, 'JR'.

4 VALVE GUIDE ALIGNING TOOL Filed May 8. 1925 IN FNTOR.

Patented June 29, 1926.

ems:

FREDERICK W. SANBOBN, 3B,, 01: DENVER, COLORADO, ASSIGNOR TO ALLISON MOTORS,

FFlQE.

INC., 01 DENVER, GULORADO, A CORPORATION OF COLORADO.

VALVE-GUIDE-ALIGNING TOOL.

App1ication filed. May 8, 1925. Serial No. 28,864..

It is often found that the Valve guide openings in internal combustion engine blocks are out of alignment, that is, they are not perpendicular to the face of the block or to the axis of the cam shaft. This invention relates to a device for reboring and truingthese valve guide openings.

In a device of this character, it is essential that the boring tool be perfectly centered over the valve seat in the engine block so that when the reboring operation has been completed the valve will rotate in perfect contact with its seat. It is also essential that the axis of the valve guide opening be perpendicular with the face of the engine block and with the axis of the cam shaft. If the former be not true, the valve will not seat. If the latter be not true there will be a side thrust upon the valve shafts which will result in rapid wear upon the valve shaft and guide.

To provide a reboring tool which will automatically center itself in the valve seat is the principal object of this invention.

Another object of this invention is to provide a device that will ream the valve stem guide openings in engine blocks absolutely perpendicular to the face of the block and to the axis of the cam shaft without adjustment.

Still another object is to so construct a device of this character that it may be readily attached to the present engine blocks Without the necessity of clamps or drilling and tapping additional openings.

A still further object is to so arrange the reaming device that it may be operated from one of the usual portable drilling machines.

Other objects and advantages reside in the detail construction of the invention, which result in simplicity economy, and efficiency and which will become more apparent from the following description.

In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. 1 is a side elevation of the invention in use upon an engine block. The engine block in this view is shown in vertical section.

Fig. 2 is a plan viewof an engine block illustrating the invention applied thereto.

Flg. 3 1s a bottom V ew, lookmg upward,

of my improved tool.

Fig. 4 is a vertical cross section through the invention and a portion of the engine block.

Those parts of the usual engine block which are illustrated on the drawing will be designated as follows: Engine blocklO, cylinders 11, valve seats 12, cylinder head studs 13, valve 1 1, valve'guide 15, valve guide opening 16, valve spring 17, valve lifter 18, and cam shaft 19.

The invention comprises a vertical sleeve 20 carrying supporting flanges 21, bifurcated as shown at 31. The lower face of the flanges is planed perfectly perpendicular to the axis of the sleeve 20. In the upper extremity of the vertical sleeve 20 a bearing 22 is secured. Through which, passes a rotatable and longitudinally moveable boring shaft 23, provided at its lower extremity with a cutting blade 24.

A centering cone 25, formed on the lower extremity of a sliding bearing 26, projects at the bottom of the sleeve 20 and acts as a lower bearing for the boring shaft 23. A recess 27 is formed in the bottom of the sleeve 20 for the reception of the cone 25. A helical spring 28 is arranged to surround the shaft 23 and be compressed between the bearings 22 and 26. The cutting blade 24 is secured in place by means of a set screw 29 and is of a length equal to the desired finished diameter of the valve guide opening 16.

The bifurcations in the flanges 21 are for the reception of the cylinder studs 13 found in the usual engine block. These cylinder studs are arranged in staggered relation as illustrated in Fig. 2 so that the invention may be placed over a valve seat 12 at an angle thereby engaging two of the studs 13 in the bifurcations in the flanges 21. The angle of placement of the device is alternated as it is moved from valve seat to valve seat, as illustrated in broken line at 30, Fig. 2. The bifurcations 31 have sufficient length and breadth to allow the device to bemoved in any direction upon the engine block, after being placed on the studs.

In the usual device of this character, the boring shaft must be centered by hand over the ,valve seat,v In thepresent"device the perpendicular to the axisof the cam shaft. centering requires no skill or thought on -As' the flanges are draWnrdOWn', tOf the face the part of the operator since the-centeringof the block the centering cone 25 will recede c e 2 vill en er ef a s amm ti a y in -1 th e e om es n wean in The spring 28 alloyistlhe beiiteringflconeito hile a"specifidforiri"ofilihe inproveihent move upward or downward toac'omm odate hasbeen'describ'edand illustrated herein, it itself to various depths and diameters of isfd esiregl to be understood that the same valve seats. I may be varied, Within the scope of the ap- When the device hasbeenvsecured intplac'e ,pentled c1aim,.,n:i h0ut departing from the l, as above described, a portable drill such as spirit of the invention.

illustrated at 34 is attachedto jthefupper. ..lfIaV'lillg thus descrihedythe IlDlZQIItiOHsjVhflt extreniity- 35rof the boring-shaft -23 so as I claim auddesire'secured by Letters Patto actuate-1t and cause thecutting blade g i to ent,1s:T 1,; I; M

ream out the valve guide opening ltii After-m A boring i001. compris llg A cylinder 3.

.the opening has been reamed' to ajlargerLfiange carriednbyfsaidcylinder at the l qvyer diameter, a length; of tubing-35 is plalced rend and at right angles tgthe ax i's th e reof A around the regular valve guide so that it and having slottedhope t rngfi 9. 1, .fifigui ing maybe-domed into place asi before. it-said flangeto the work; abea iingsecured in In :setting up the ClGVLCFBy-th B-DODG 1sitheglupperqend QfeS 'lCl" cyhnderg a second placed in a-valve seat 12: Sinceu-the cone is bearingislidably mounted, ing the loyyer exconcentric wy-ith the boringshaftlthe 'latterv litremity of said c3 rli nde ,anenlarged :Wl-ll now be automaticallycentered v v1th are ,conicalheadcarried by, said second bear ng --latiorr tothe valve seat, a NutsZ-BQ are; placed. and arranged to pro ect-into a,;ounte;r;bpre

on the studs and the flanges: 21 drawnidown;vat;the.,loWe13 end of, said cylinder a sh aft 1' against the face f bloek 10. 1; Since the i slidably androtatabl'y passing through both boring shaft 23 is perpendioularito the lower of saldbearings and aQspriirg'"arranged to face of the flangesit .Will. .:be. automatically .,be .icompreSS9d bQ WGQIL ft d bftf il lg l,

I brought to aperpendiculariposition relative. cylinder acting as a guide 'forvsald conical totheface ofthe blookfld and, since, from headhfle 3) the method oflits n1anufactuire,the;- face of In testimony whereof, I' affix my signature.

theblock 1-0 is parallel to the axis of thercam shaft 19, the boring shaft 23 Will" be also FREDERICK W. sXi iBhRufJR. 

